Fastening device

ABSTRACT

THE PLASTIC TUBULAR PORTION OF A FASTENING DEVICE IS PROVIDED AT ONE END WITH A CLOSURE DISC WHICH IS SWINGABLY ATTACHED THERETO, AND WHICH IS HELD IN A CLOSING POSITION BY LOCKING MEANS INTERACTING BETWEEN ADJACENT SURFACES OF THE DISC AND OF THE TUBULAR PORTION. DISPLACED FROM ITS CLOSING POSITION BY THE FORWARD MOTION OF A SCREW, BOLT OR THE LIKE ADVANCED THROUGH THE TUBULAR PORTION, THE DISC IS SWUNG OUT OF THE WAY INTO AN OPEN POSITION AND MAY BE SUBSEQUENTLY RESET INTO THE CLOSING POSITION.

Sept. 20, 1971 L. A. MORTENSEN mswmum DEVICE Original Filed April 4., 1968 Patented Sept. 20, 1971 3,605,548 The wall plug for inserting in a hole and shown in FASTENING DEVICE FIG. 3 consists of a tubular plastic portion 12 which pref- L i A k Mortensen, Kongevejeu 35 erabl y has conventional outer and inner grooves and may Bi k d, D k consist of relatively soft plastic. The tubular plastic por- Continuation of application Ser. No. 718,950, Apr. 4, 5 tion 12 is made in one piece with a hinge band 13 and a 1968 This application Aug. 4, 1969, Ser. No. 849,266 closing disc 14 which, by bending the hinge band 13, can Clalms P y, PP i g2/ 6 7 P 1967! be inserted in the end aperture of the tubular plastic por- Int F16) 13/06 tion 12 and may be brought into engagement with a cir- U s CL 35 1 Claim cumferential groove 15 made therem.

When using the wall plug shown in FIG. 3 the closing disc 14 is closed and the plug is inserted in a bored hole. Thereafter a screw is screwed into the plug. When neces- ABSTRACT OF THE DISCLOSURE The plastic tubular portion of a fastening device is Sal"y the Screw can be screwed entirely through the Plug, provided at one end with a closure disc which is swingably thhrehy Pushing the closing disc into its p Positionattached thereto, and which is held in a closing position 15 The mold'ih Wall P Shown in 4 and Serving for by locking means interacting between adjacent surfaces of being molded into Concrete has a flange 16 and a relathe disc and of the tubular portion Displaced from its tively thin-walled tubular portion 17 and a thick-walled closing position by the f d motion of a screw, bolt tubular portion 18 in which there is made an inner screw or the like advanced through the tubular Portion, the thread 19, for instance a cylindrical screw thread, for a disc is swung out f the Way into an open position and 20 machine screw. The portion 18 is molded in one piece may be subsequently reset into the closing position. with a hinge hand 20 and a Closing disc 21 which, by

bending the hinge band 20, can be inserted in the end apertures of the portion 18 and be brought into engage- Th1s apphcahon 1s a cohhhuahoh of apphcahoh ment with acircumferential groove 22 made therein. When No. 718,950, now abandoned. 2''

o the mold-in wall plug is to be molded in, the closing disc The h h relates to a fastehlhg deylce for In 21 is closed first. The shown embodiments entails that connectlon with a screw and of the type having a tubular the moldin lu ma be molded while usin a moldin plastic portion into WhlCll the screw is screwed, and a g p g y g g core that is su orted at both ends in the mold. closing (1180 that can close the plastic portion at one end, pp

The shown and described embodiments are only to be and Whlch can h P by Screwlhg the screw through considered by way of example as several variations are The characteristic features of the fastening device acconceivable within the scope of the invention. In an excording to the invention IS that the closing dlsc 1s hlnged pansion plug of the same type as the one shown in FIGS. on the tubular plastic portion. Hereby it is obtained that 1 and 2 it will thus be possible to make the Outer part the closing disc will not become lost.

v with a closing disc hinged onto it. In that case the sectors The p h P 1 and the 61051118 p h should be connected with each other during the manumg to the mvehhoh be cohhecfed by means of a hlhge facture by means of thin-walled portions which can be hand, and they may be molded in one piece. Hereby there Stretched or tom apart. is obtained a simple, cheap and practical construction.

What is claimed is: In the h there shown m embodlments 1. A fastening device for use in connection with a screw of a fastening device according to the invention: 40

comprising a tubular portion constituted of a plastic and 1 Showmg a longltudmal Sectlon through an open at each end, a closure disc constituted of a plastic expanslon Plug and movable between a first position closing one of said FIG. 2 a bottom view of same,

open ends and a second position uncovering said one G a longltudmal Secnon through a Wan Plug for end, said disc being of circular configuration and in said insertion 1n a bored hole, and

first position being adapted to be engaged along its pe- 4 a P Wall Plug f moldmg riphery by said recess, elastically recoverably bendable The expanslon P shown 1 1 Fonslsts of an hinge means constituted of a plastic and connecting and Inner 1 i 1s m Plastlc mstance rather being integrally formed with said disc and said tubular hard h elastlc plastlc' It has a comcal ocuter Surface portion, and resilient, non-permanently deformable latchfor l wlth a cone apex angle of and an ing means constituted of a plastic and for releasably holdner cylindrical screw thread 3 for a machine screw. The

ing said disc in said first position, said latching means Outerpart also conslsts of Plastlc and 15 made by mlectlon being defined by an annular undercut recess in the tubular molding. It has an end flange 4, a short tubular end porortion roximate to said 0 en end. tion 5, and an expansion portion 6 divided up into two F p p or more longitudinal extending sectors, said expansion References Cited portion having an inner conical surface corresponding to the outer surface of the inner part 1 and having a cylin- UNITED STATES PATENTS drical outer surface. The outer part is preferably made of 1,241,827 10/1917 Davis 52704 a relatively hard stifi bending-elastic plastic. 2,277,056 3/ 1942 Colfman 85-83 The inner part 1 is molded integrally with a hinge 2,334,046 11/ 1943 Tinnerman 85-35 band 7 and a closing disc 8 carried by the hinge band, 3,313,078 4/1967 Rohe 52-708 said closing disc having a lens-shaped cross section. The 3,413,887 12/1968 Von Wolff et a1 85-83 inner part has, at its bored end, a conical end surface 9 3,472,111 10/ 1969 Ono 84-74 and an axially projecting outer cylindrical collar 10 in FOREIGN PATENTS which there is made a recess 11 for the hinge band 7. The inner side of the collar 10 is undercut. The closing disc 767,444 5/1934 France 8569 8 can, by bending the hinge band 7, be inserted in the 624, 6/ 9 Great Brltaln -33 o enin in the collar 10 the hinge band 7 being received ir l the recess 11. When a screw is screwed through the EDWARD ALLEN, PflmafY Examlner inner part, the end of the screw will push the closing U S Cl X R disc away from its position in the collar 10. The closing disc may later be returned to its position in the collar 10. 52-404, 707; -82 

